The Working Principle and Composition Structure of Brushless Motors
Brushless motors, as an efficient and energy-saving type of motor, play a significant role in modern technology. Its principle is to drive the rotation of the rotor by controlling the direction and magnitude of the current through the internal electronic control system. Brushless motors are mainly composed of stators, rotors and drivers.
The stator is the stationary part of the motor. It has three-phase windings wound on it, which are symmetrically distributed and usually made of magnetic conducting materials such as silicon steel sheets to improve the conduction efficiency of the magnetic field. When a specific sequence of currents is passed through the three-phase windings, a rotating magnetic field is generated inside the stator.
The rotor is a permanent magnet, generally made of high-performance permanent magnetic materials such as neodymium iron boron. The magnetic field generated by the permanent magnet interacts with the rotating magnetic field generated by the stator windings, thereby causing the rotor to be subjected to torque and rotate.
The driver part includes position detection and current control. Position detection elements such as Hall sensors are usually used to detect the position information of the rotor and feed this information back to the electronic control system so that the direction and magnitude of the current can be accurately controlled.
This design of brushless motors not only improves the efficiency of the motor but also extends its lifespan, making it widely used in numerous fields.
